shǎ
傻头傻脑
shǎ tóu shǎ nǎo
Silly and foolish; acting stupid
装疯卖傻
zhuāng fēng mài shǎ
To pretend to be crazy or stupid; to play the fool
吓傻了。
xià shǎ le
Scared silly; frightened out of one's wits